Friedrich wippermalsnsr



(No Model.)

' WIPPBRMANN.

WEB DRY-ING CYLINDER'.

No. 590,928. Patented-Sept; 23, 1897.

/NvE/ro/r:

Hamers WNfSSES.

UNITED STATES FRIEDRICH WIPPERMANN,

PATENT OFFICE..

OF STOTZHEIM, GERMANY.

wEB-DRYING CYLINDER.

SPECIFICATION forming part of Letters Patent N0. 590,928, datedSeptember 28, 189'?.

Application filed April 22, 1897 v T0 @ZZ whom t nt/ty col/werft:

Be it known that I, FRIEDRICH Wirrna MANN, a subject of the King ofPrussia, German Emperor, residing at Stotzheim, in the Kingdom ofPrussia, Germany, have invented new and useful Improvements inDrying-Cylinders for Breadths of Stuff and Paper, of which the followingis a specication.

This invention relates to a rotary dryingcylinder for brousmatter,paper,pasteboard,

and tissues heated by a coil rotatably arranged in the cylindrical innerspace, so that the cylinder constructed according to this inventionoffers over the hitherto-used drying' appara-A tus the advantage that itis completely protected against any explosion and that owing to aninsulating-casing provided in the inner space of the cylinder and to thereduction of the frontal surfaces a loss of heat is prevented as much aspossible.

The apparatus is shown in the accompanying drawings.

Figure l is a longitudinal section, and Fig. 2 a side elevation, partlyin cross-section, of the drying-cylinder.

The construction and manner of working of the drying-cylinderv are asfollows:

The apparatus consists, essentially, of the outer cylinder-casing A, ofthe insulatingcasing C, and of the heating-coil E. The outercylinder-casing A, made of cast metal or of Wire-cloth, is connected bythe ring A to the inner cylinder-casing B, which in combination with thecasing D, of sheet metal, forms a hollow space which is illed with aninsulating material for the purpose of preventing as much as possible aradiation of heat to the side of the cylinder turned toward the axis ofthe latter. This double casing is connected with the axis by means ofiron arms H, secured to the connecting-ring. of the twocylinder-casings.

The cylinder is heated by means of the.

steam-coil E, spirally surrounding the insulating-casing,whi1e the steamis admitted and discharged by the tubes F and G, respectively,introduced centrally with respect to the cylinder axis andguidedvon both sides along one of the connecting-arms H, to which thesaid tubes are fastened, so that theirrotary motion is transmitted tothe heating-coil.

Serial N0,`633,356. (No model.)

very small one, the output of the apparatusremaining the same. The newdrying-cylinder offers, moreover, the advantage that as there is notension in the cylinder any'danger of explosion is completely avoided.The

cylinder-walls may therefore be of smaller thickness, so that the totalweight of the apparatus is considerably reduced and a much lowerimpellent power is required.

Havin g now fully described and ascertained .the nature ofmysaidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. A drying apparatus having two casings arranged onewithin the other, heads connectingthe casings, and a heating-coil runbetween the casings.

2. A drying apparatus having two casings arranged one within the otherand connected by heads, and a heat-conveying apparatus extending betweenthe casings.

3. A drying apparatus consisting in two casingsarranged one within theother, heads for the cylinder, the heads having orifices therein, and aheating-coil extending through the orifices of the heads and woundbetween the casings.

4. A heating apparatus having two casings arranged one within the other,the inner side being of non-conducting material, heads for the casings,and heating devices extending between the casings.

5. A heating apparatus consisting in two casings arranged one within theother, the inner casing being of, non-conducting material, the apparatusalso having two heads with oriiiced central portions, and a heating-coilextendingthrough the orifices of the head and wound'between the twocasings of the cylinder.

In testimony whereof I have signed lmy nameto this specilication in thepresence of two subscribing witnesses.

FRIEDRICH VIPPERMANN. Witnesses:

OT'ro MERKENS, W. J os. SOMMER.

